Reference Interval or Reference Limit 参考区间和参考限
limit of the reference range 极限的参考范围
Limit Reference Point 极限参考点
You may also want to limit the instances viewed based on a time reference.
还可以根据时间引用限制显示的实例。
Alternatively, to limit the scope of a data source, the element can be placed in the context of each Web application that will reference the data source.
或者限制数据源的范围，可以将元素放置在将引用该数据源的每个Web应用程序的上下文中。
Astrometric Limit: The maximum residual in the place of a reference star, specified in arc seconds.
天文测量误差极限：参考星位置对应的最大误差，用角秒表示。
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